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A spherical cavity of radius (R)/(2) is ...

A spherical cavity of radius `(R)/(2)` is made in a sphere of radius `R` and mass `M`. The centre of the cavity is at a distance `(R)/(2)` from the centre of the sphere. The intensity of gravitational field at the centre of cavity is `(G M)/(n R^(2)) .` Find `n .`

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